Here is a summary of all designs shared with the community. If any of your design is missing from here, please contact us so we can update this post. Thanks everyone!You are welcomed to make your requests in the replies. After the requested file is updated, we will delete the replies so that we can keep this post as simple as possible.

The one on the left is a fan duct that came with my N2+ in October2016, it was fdm printedThe one on the right is a new fan duct that came with my N2 a week ago, it seems casted

The new one is 3mm taller and it's more efficient because :- the 3mm more concern the "window" in which the air is passing through to cool the heatsink (that allows to cool the last cooling fin at the bottom that used to be not very cooled with the previous fan duct)- it blows 3mm closer to the object

The only remark i can make is that the parting line of the mould let a slight shift inside the bottom "window" (object cooling) and dust stays here. So, a light sanding and it's perfect in my opinion.

So, could you can share a stl file (or .obj or other) of this new design here µ?